web/views/authentication.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
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"""user authentication component
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:organization: Logilab
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:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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from logilab.common.decorators import clear_cache
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from cubicweb import AuthenticationError, BadConnectionId
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from cubicweb.dbapi import repo_connect, ConnectionProperties
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from cubicweb.web import ExplicitLogin, InvalidSession
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from cubicweb.web.application import AbstractAuthenticationManager
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class RepositoryAuthenticationManager(AbstractAuthenticationManager):
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    """authenticate user associated to a request and check session validity"""
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    def __init__(self):
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        self.repo = self.config.repository(self.vreg)
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        self.log_queries = self.config['query-log-file']
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    def validate_session(self, req, session):
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        """check session validity, and return eventually hijacked session
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        :raise InvalidSession:
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          if session is corrupted for a reason or another and should be closed
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        """
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        # with this authentication manager, session is actually a dbapi
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        # connection
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        cnx = session
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        login = req.get_authorization()[0]
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        try:
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            # calling cnx.user() check connection validity, raise
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            # BadConnectionId on failure
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            user = cnx.user(req)
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            if login and user.login != login:
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                cnx.close()
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                raise InvalidSession('login mismatch')
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        except BadConnectionId:
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            # check if a connection should be automatically restablished
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            if (login is None or login == cnx.login):
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                login, password = cnx.login, cnx.password
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                cnx = self.authenticate(req, login, password)
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                user = cnx.user(req)
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                # backport session's data
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                cnx.data = session.data
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            else:
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                raise InvalidSession('bad connection id')
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        # associate the connection to the current request
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        req.set_connection(cnx, user)
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        return cnx
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    def authenticate(self, req, _login=None, _password=None):
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        """authenticate user and return corresponding user object
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        :raise ExplicitLogin: if authentication is required (no authentication
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        info found or wrong user/password)
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        Note: this method is violating AuthenticationManager interface by
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        returning a session instance instead of the user. This is expected by
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        the InMemoryRepositorySessionManager.
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        """
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        if _login is not None:
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            login, password = _login, _password
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        else:
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            login, password = req.get_authorization()
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        if not login:
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            # No session and no login -> try anonymous
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            login, password = self.vreg.config.anonymous_user()
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            if not login: # anonymous not authorized
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                raise ExplicitLogin()
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        # remove possibly cached cursor coming from closed connection
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        clear_cache(req, 'cursor')
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        cnxprops = ConnectionProperties(self.vreg.config.repo_method,
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                                        close=False, log=self.log_queries)
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        try:
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            cnx = repo_connect(self.repo, login, password, cnxprops=cnxprops)
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        except AuthenticationError:
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            req.set_message(req._('authentication failure'))
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            # restore an anonymous connection if possible
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            anonlogin, anonpassword = self.vreg.config.anonymous_user()
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            if anonlogin and anonlogin != login:
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                cnx = repo_connect(self.repo, anonlogin, anonpassword,
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                                   cnxprops=cnxprops)
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                self._init_cnx(cnx, anonlogin, anonpassword)
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            else:
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                raise ExplicitLogin()
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        else:
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            self._init_cnx(cnx, login, password)
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        # associate the connection to the current request
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        req.set_connection(cnx)
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        return cnx
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    def _init_cnx(self, cnx, login, password):
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        # decorate connection
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        if login == self.vreg.config.anonymous_user()[0]:
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            cnx.anonymous_connection = True
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        cnx.vreg = self.vreg
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        cnx.login = login
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        cnx.password = password
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